Synthesis, biotransformation and stereochemistry of 6β-sesquiterpene lactones: syntheses of 6β-artepaulin, 11,13-dihydro-6β-tuberiferin,5,15-dihydro-6β-oopodin, 4-epi-6β-vulgarin and 6β-vulgarin

1. Amate, Y.
2. Bretón, J.L.
3. Garcia-Granados, A.
4. Martinez, A.
5. Esther Onorato and, M.
6. Sáenz de Buruaga, A.